Drupal 8.x

While installing Drupal 8.8.5, I save the project name Drupal_beginner. Now, I would like to make another project. Do I need to uninstall again and then install back with the new project name? 

I think there must be a way. I have already installed different modules like admin, themes, contact storage, token, devel. No if I need to uninstall Drupal and install back with the new project, I have re-install all these modules.

Please advice. 

Using D9.  I'm looking for a simple way to update a field in a table with AJAX.  I'm familiar with PHP and MySQL, but I'm a rookie as far as writing a module, but I'm thinking I might try.  But if I can do the simple task I need with an existing module, that'd be great.   It would need to be able to add/remove values to a multi-value field, so I think it would take a short piece of PHP to make it work.

I´m developing a module and I´m working with EVA module to attach a view to a content type. 

I´ve created a content type called 'Sports' and another called 'Clubs' and I´ve got that in each sportonly appears the clubs which their field _sport match with the nid of the corresponding sport , and the final view would be like a ranking. Finally, I´ve created another field called 'Group' and then I would like that view repeats itself depending on the group. That is to say :

I have a sport called Football and their clubs like Madrid, Barcelona, Sevilla, etc.

I´m developing a module and I would like to create a menu like menu structure. I´ve coded the my_module.routing.yml file and the my_module.links.menu.yml. I´ve all pages built in routing and their links in links.menu , that is to say, I've got the complete tree of routes made up. But I´dont get that when you click on the root link, drupal sends a `type` of menu like Structure Menu.

Attach a image for better compression! I would like to do this with the routes of my module.